WO2016091220A1

WO2016091220A1 - Acute angle magnetic damper

Info

Publication number: WO2016091220A1
Application number: PCT/CN2015/097201
Authority: WO
Inventors: 廖新春; 廖超辉
Original assignee: 廖新春
Priority date: 2014-12-12
Filing date: 2015-12-11
Publication date: 2016-06-16
Also published as: CN204271879U

Abstract

An acute angle magnetic damper (10) comprises a stator excitation body (102) and a rotor acute angle magnetic body (104). The stator excitation body (102) comprises an outer ring (101) and a plurality of pairs of excitation magnetic poles (106) extending inwards from the outer ring. The rotor acute angle magnetic body (104) comprises an inner ring (117) and a plurality of V-shaped structures (112) radially distributed outwards from the inner ring. An induction magnetic pole (118) is formed at the connecting part of adjacent two arms of adjacent V-shaped structures (112). A tip angle formed by two edges on the outer side of each V-shaped structure (112) is an angle A, and the angle A is larger than zero and smaller than 90 degrees. A tip angle formed by two edges on the inner side of each V-shaped structure (112) is an angle B, and the angle B is larger than zero and smaller than 90 degrees. The damper exhibits excellent damping torque at high, middle and low speeds, overcomes the defect of small low-speed torque of an existing eddy current damper, has dual characteristics of hysteresis and eddy current, and has a wide use value.

Description

Acute angle magnetic damper

Technical field

The invention relates to the field of electromagnetic damping, in particular to an acute magnetic damper.

Background technique

Electromagnetic dampers are devices that use electromagnetic principles to provide motion resistance and reduce kinetic energy. At present, in the field of electromagnetic damping of the prior art, there are two types of electromagnetic dampers that can generate damping torque. The first type of dampers use the hysteresis effect of the coercive force of the material to generate electromagnetic damping torque; the second type of damper is The principle of electromagnetic induction - eddy current effect (power generation) is used to generate electromagnetic damping torque. The disadvantages of both are: the hysteresis effect damper has strict requirements on materials and high cost; the eddy current effect damper has poor electromagnetic induction effect at low speed. The above two types of electromagnetic dampers are subject to certain limitations in practical applications.

Summary of the invention

The object of the present invention is to solve the above-mentioned technical drawbacks, and it is therefore necessary to provide an acute-angle magnetic damper.

An acute-angle magnetic damper comprising a stator excitation magnet and a rotor acute-angle magnetic body;

The stator magnetizer includes an outer ring and a plurality of pairs of field poles extending inward from the outer ring;

The rotor acute-angle magnetic body comprises a plurality of V-shaped structures having inner rings and radially distributed outward from the inner ring; adjacent two-arm joints of adjacent V-shaped structures constitute the induction magnetic pole; two outer sides of each V-shaped structure The angle formed by the edge of the strip is an angle A, and the angle is greater than zero degrees less than 90 degrees; the two sides of each V-shaped structure form a tip angle of B angle, and the angle is greater than zero degrees less than 90 degrees.

Wherein, the angle of the angle A is 30 degrees - 60 degrees, and the angle of the angle B is 30 degrees - 60 degrees.

Wherein, the number of the magnetic poles is n, the number of the induced magnetic poles is m, and m and n satisfy the relationship 1: (n*2)±1=m.

Wherein, the number of the magnetic poles is n, the number of the induced magnetic poles is m, and m and n satisfy the relationship of 2: (n*2)±2=m.

The number of pairs of the excitation magnetic poles is five, and the number of the induction magnetic poles is eleven.

The number of pairs of the excitation magnetic poles is five, and the number of the induction magnetic poles is twelve.

Wherein, the middle portion of the field pole may be wound with a wire for exciting the field pole.

Wherein, the rotor acute-angle magnetic body is integrally formed.

Wherein, the field pole may be a permanent magnet.

The beneficial effects of the invention are: an acute-angle magnetic damper designed by the new principle acute-angle magnetic force, which exhibits good damping torque at high, medium and low speeds, and solves the defect that the existing eddy current damper has low low-speed moment; It has the dual characteristics of hysteresis and eddy current, and it has wider use value compared with hysteresis and eddy current damper; it provides an excellent damping product for China's defense, shipbuilding, water conservancy and electric power industries.

DRAWINGS

The above and other objects, features and advantages of the present invention will become more <RTIgt; The same reference numerals are used throughout the drawings to refer to the same parts.

1 is a schematic structural view of an acute magnetic damper provided by a first preferred embodiment.

2 is a schematic view showing the structure of a rotor V-shaped structure of the acute-angle magnetic damper of FIG. 1.

3 is a schematic structural view of an acute magnetic damper provided by the second preferred embodiment.

4 is a schematic structural view of a rotor V-shaped structure of the acute-angle magnetic damper of FIG. 3.

Figure 5 is a schematic illustration of the apparatus used to illustrate the principles of the acute magnetic damper provided by the preferred embodiment.

Figure 6 is a schematic view showing the magnetic field line a of the V-shaped structure used to explain the principle of the acute magnetic damper provided by the preferred embodiment.

Figure 7 is a schematic view of the magnetic domain b of the V-shaped structure used to illustrate the principle of the acute magnetic damper provided by the preferred embodiment.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. The embodiments are provided to facilitate a more complete and detailed understanding of the present disclosure.

Referring to FIG. 1 , an acute-angle magnetic damper 10 according to a first preferred embodiment of the present invention includes a stator field magnet 102 and a rotor acute-angle magnetic body 104. The rotor acute-angle magnetic body 104 is disposed on the stator-excited body. 102 is internal and rotatable; the stator exciter includes an outer ring 101, and a plurality of pairs of field poles 106 extending inwardly from the outer ring 101. Each pair of field poles 106 has N, S poles, and each pole N , S is arranged in phase. The middle portion of the field pole 106 may be wound with a wire for exciting the field pole 106. Specifically, the neck 110 of the field pole 106 may be wound with a wire (not shown) to excite the field pole 106, each excitation. The magnetic pole 106 is a shrouded pole structure.

Referring to FIG. 2, the rotor acute-angle magnetic body 104 includes an inner ring 117, a plurality of V-shaped structures 112 radially outwardly distributed from the inner ring 117; adjacent two-arm joints of adjacent V-shaped structures constitute the induction The magnetic pole 118; the number of the inductive magnetic poles 118 of the rotor acute-angle magnetic body 104 is singular, and is a salient pole structure; the two

sides

113, 114 outside each V-shaped structure 112 form an angle of the tip angle A, the angle More than zero degrees less than 90 degrees; the two

sides

115, 116 on the inner side of each V-shaped structure 112 form a tip angle of B angle, the angle of which is greater than zero degrees less than 90 degrees. Preferably, the angle of the angle A is 30 degrees - 60 degrees, and the angle of the angle B is 30 degrees - 60 degrees.

Preferably, the rotor acute-angle magnetic body 104 is an integrally formed rotor. The integrally formed rotor can be die-casted by one-time die-casting process, which is simple to manufacture, saves time and labor, and improves the production efficiency of the acute-angle magnetic damper; the common materials can be used, such as Q235, 45# steel and electric iron. .

In order to generate a smooth damping torque with the magnetic pole change when the acute magnetic damper 10 is in operation, the number of the magnetic poles 106 is n, the number of the induced magnetic poles 118 is m; m and n satisfy the relationship 1: (n*2) ±1=m, in the present embodiment, it is assumed that the number of pairs of the field poles 106 of the stator field magnet 102 is n=5 pairs, and the number of the induced magnetic poles 118 is m=11, which is satisfied. The above relationship 1.

The above-mentioned acute-angle magnetic damper 10 firstly applies an excitation current to the stator excitation magnet 102, and then sharpens the rotor. After the angular magnetic body 104 is added with a certain rotational moment, the rotor acute-angle magnetic body 104 remains stationary (the damping torque is small), exhibiting a hysteresis effect; when the external force drives the rotor acute-angle magnetic body 104 to rotate, the damping torque becomes large, The utility model has the characteristics that the rotation speed of the magnetic body with the acute angle of the rotor increases and the damping torque increases, and the eddy current effect is exhibited. Therefore, the above-described acute-angle magnetic damper 10 has the double-effect characteristics of hysteresis and eddy current, which makes the above-described application of the acute-angle magnetic damper 10 wider.

Referring to FIG. 3, an acute-angle magnetic damper 20 according to a second preferred embodiment of the present invention includes a stator excitation magnet 202 and a rotor acute-angle magnetic body 204. The rotor acute-angle magnetic body 204 is disposed on the stator excitation magnet. 202 is internal and rotatable; the stator magnetizer includes an outer ring 201, and a plurality of pairs of field poles 206 extending inwardly from the outer ring 201. Each pair of field poles 206 has N, S poles, and each pole N , S is arranged in phase. The middle portion of the field pole 206 may be wound with a wire for exciting the field pole 206. Specifically, the neck 210 of the field pole 206 may be wound with a wire (not shown) to excite the field pole 206, each excitation. The magnetic pole 206 is a cover pole structure.

Referring to FIG. 4, the rotor acute-angle magnetic body 204 includes an inner ring 217, a plurality of V-shaped structures 212 radially outwardly distributed from the inner ring 217; adjacent two-arm joints of adjacent V-shaped structures constitute the induction The magnetic pole 218; the number of the induced magnetic poles 218 of the rotor acute-angle magnetic body 204 is a double number, and is a salient pole structure; the two

sides

213, 214 outside the V-shaped structure 212 form an angle of the tip A angle, The angle is greater than zero degrees less than 90 degrees; the two

sides

215, 216 on the inner side of each V-shaped structure 212 form a tip angle of B angle, the angle of which is greater than zero degrees less than 90 degrees. Preferably, the angle of the angle A is 30 degrees - 60 degrees, and the angle of the angle B is 30 degrees - 60 degrees.

Preferably, the rotor acute-angle magnetic body 204 is an integrally formed rotor. The integrally formed rotor can be die-casted by one-time die-casting process, which is simple to manufacture, saves time and labor, and improves the production efficiency of the acute-angle magnetic damper; the common materials can be used, such as Q235, 45# steel and electric iron. .

In order to make the acute magnetic damping of the acute magnetic damper 20 to produce a smooth damping torque, the number of the magnetic poles 206 is n, the number of the magnetic poles 218 is m; m and n satisfy the relationship 2: (n*2) ) ±2=m, in the present embodiment, the number of pairs of the field poles 206 of the stator field magnet 202 is n=5 pairs, and the number of the induced magnetic poles 218 is m=12, which satisfies the above. Relation 2

In the above-mentioned acute-angle magnetic damper 20, the excitation current is first applied to the stator excitation magnet 202, and after a certain rotational moment is applied to the rotor acute-angle magnetic body 204, the rotor acute-angle magnetic body 204 remains stationary (damping torque is small), and the performance The hysteresis effect is generated; when the external force drives the rotor acute-angle magnetic body 204 to rotate, the damping torque becomes large, and the rotation speed of the magnetic body with the acute angle of the rotor increases, and the damping torque increases, showing an eddy current effect. Therefore, the above-described acute-angle magnetic damper 20 has the characteristics of hysteresis and eddy current double effect, which makes the above-mentioned acute-angle magnetic damper 20 have a wider application range.

In the first embodiment, since the stator field magnet 102 is 10 field poles 106 and the rotor acute angle magnetic body 104 is 11 induction poles 118, the magnetic poles of the stator and the rotor do not form a symmetrical relationship during operation. The force applied to the rotating shaft is always asymmetrical; when manufacturing a high-power acute-angle magnetic damper, it is difficult to make the whole machine stable and easy to generate body vibration; however, since the acute-angle magnetic damper can be applied to many powers in many aspects and The speed is slow, such as fitness equipment, instrument damping, etc., so the condition defined by the relational expression 1 of the first embodiment can be completely employed in manufacturing a low-power acute-angle magnetic damper. In the second embodiment, the condition defined by relation 2, the stator field magnet 202 is 10 field poles 206, and the rotor acute angle magnetic body 204 is 12 induction poles 218, so that the magnetic poles of the stator and the rotor form a symmetry during operation. The relationship can make the whole machine work smoothly; the high-power acute-angle magnetic damper is most suitable for the relationship 2, such as auxiliary brakes for deep well drilling, automobile retarders, train retarders, etc.

(1) Explanation of the principle of the acute-angle magnetic damper of the present invention:

The principle of acute angle magnetic force belongs to a kind of natural electromagnetic phenomenon, which is another new natural law found in the principle of electromagnetic induction. In order to better understand and understand the nature of the acute-angle magnetic force, we first make a macroscopic experiment that is easy to understand and understand. As shown in Fig. 5, it is a schematic diagram of a sharp turning device for a high-speed moving object. A ball with a high-speed movement of a certain quality hits a sharp turning device (U-shaped baffle) in front, and the ball follows the geometry of the device. Make a corresponding sharp turn movement, after the device, the ball continues to move forward in the new direction of change, but the speed of the ball is slowed down.

Now analyze the characteristics of sharp turns of high-speed moving objects. Referring to FIG. 5, when the ball 22 hits the sharp turning device 24 (U-shaped baffle), the ball 22 is pressed and rubbed against the curved surface of the device 24, and the following three physical phenomena occur during the pressing friction process: The squeezing will change the original direction of movement of the ball 22; 2) the friction will generate heat; and 3) the squeezing friction will slow the movement of the ball 22. These three points are the inevitable result of the sharp turn of the high-speed moving objects in the macro world.

The acute angle magnetic force is the category of the microscopic world material movement, and the microscopic material motion also has the properties associated with the macroscopic object motion.

Referring to FIG. 6, a schematic diagram of the external magnetic field line a is transmitted in the acute angle region of the ferromagnetic material. Referring to FIG. 7, the magnetic domain of the ferromagnetic material in the acute angular region transmits the external magnetic field force b. A magnetic domain is a magnetic region composed of many molecular current loops in a ferromagnetic material. Under the action of the external magnetic field, the magnetic field direction of each magnetic domain molecular current coil is uniform, and thus has a certain magnetic property. When the external magnetic field does not exist, the ferromagnetic material does not exhibit magnetic properties due to the disorder of the respective magnetic domains. When an external magnetic field is applied to both ends of the linear ferromagnetic material, the magnetic domain magnetic pole directions are connected in a straight line along the direction of the external magnetic field, and the connection between the magnetic poles does not exist in the distance space. However, if the ferromagnetic material is a V-shaped structure, the magnetic path of the tip end region of the V-shaped structure is very tortuous, and therefore, in the magnetic circuit of the tip region, the magnetic path connecting the magnetic domains and the magnetic domains is opened. A certain distance, forming a curved magnetic circuit, curved magnetic lines of force (see the magnetic circuit at the tip of Figure 7) need to occupy a certain space. In a very curved magnetic circuit, the polarity of each magnetic domain cannot be combined in a straight line, and there is always a certain angular difference in the polarity direction, which is the cause of the distance between the polarities of the above magnetic domains.

Since the magnetic lines of force have a tendency to shorten their own length, the curved magnetic lines of force are formed by applying tension. This applied tension is derived from the magnetic potential energy of the external alternating magnetic field, so the tension is also a potential energy, which in turn is derived from the conversion of external kinetic energy (here only for the acute magnetic damper). Therefore, it can be said that the damping force generated by the acute-angle magnetic force is converted from external kinetic energy. If the applied magnetic field is alternating, the tension potential energy will alternate accordingly. The curved magnetic field line has the potential energy. When the external magnetic field strength decreases from the maximum value to the zero point, the tension potential energy drops to zero point, and the tension potential energy is converted. The heat energy is consumed; when the magnetic field strength rises from zero to the other polarity maximum, the tension potential energy rises from zero to the maximum value, and the external force is required to cause the magnetic lines to be bent again. It is said that the above change process is like the string on the bow of our force. The line of magnetic force of the line must be first bent and then disappeared. Thereby consuming external kinetic energy and converting it into thermal energy of internal molecules.

Therefore, it can be seen from FIG. 6 and FIG. 7 that the magnetic force line a or the magnetic domain b cannot be connected in the acute-angle tip region, that is, the N-pole and the S-pole are unlikely to be connected in a straight line, and there is always a directional angular difference. . We know that when the external alternating magnetic field passes through the ferromagnetic body, the magnetic domains in the inner part of the ferromagnetic body should constantly change the magnetic pole directions of N and S, and adapt to the connection and frequency change consistent with the polarity direction of the alternating magnetic field. This is bound to cause the magnetic domains in the interior of the ferromagnetic body to produce a rotation that is consistent with the frequency of the external alternating magnetic field (a theoretical derivation). In the acute-angle tip region of the V-shaped structure, the direction of the magnetic poles of N and S between the rotating magnetic domain and the magnetic domain cannot be connected in a straight line, and there is a certain angular difference in directivity. In the process of generating a rotation with a magnetic pole angle difference, the magnetic domains are like the extrusion friction process of the high-speed moving object and the sharp turning baffle. The following three physical phenomena occur: 1) The curved magnetic circuit changes. The direction of the original external magnetic field; 2) The magnetic potential energy of the external alternating magnetic field is consumed and converted into thermal energy by overcoming the bending of the magnetic field line; 3) due to the extremely curved magnetic circuit, the magnetic domain transmits the external magnetic field force and there is a magnetic pole angle difference. The magnetic domain rotation speed is slowed down, causing hysteresis. These three microscopic physical phenomena are similar to the above three macroscopic physical phenomena and have been verified by subsequent experiments. In particular, in the third point, in the experiment, after the excitation of the sharp-angle magnetic damper prototype, the rotor was directly pushed by hand, and it was suddenly pushed, suddenly stopped, and the rotor swung forward and immediately bounced back a little distance, which proved the acute angle magnetic force. The damper has a hysteresis effect and produces a damping torque.

The principle of electromagnetics is a basic principle of physics. The principle of acute-angle magnetic force will be an effective supplement to the basic principle of electromagnetics. It has new enlightenment for people to understand the nature and nature of magnetism. The acute-angle magnetic damper has new development in the field of electromagnetics. The development trend.

(2) Comparison of experimental data

We compare the performance of the acute-angle magnetic damper of this scheme with the performance of the eddy current induction damper. The outstanding characteristics of the magnetic damper are: the low-frequency slow speed effect is remarkable; the high-frequency fast effect is balanced.

The following is the prototype experiment of the applicant's acute-angle magnetic damper prototype and eddy current induction damper prototype; in the following comparative examples, the eddy current induction damper prototype used in addition to the rotor magnetic induction body and the acute-angle magnetic damper prototype rotor magnetic induction structure is not Similarly, other structural materials and the like are identical; the rotor shape of the eddy current induction damper is a cylindrical ferromagnetic body.

Comparative Example 1: High-altitude hanging drop experiment

The first set of tests: the sharp-angle magnetic damper prototype and the eddy current induction damper prototype were placed on a 1.5-meter-high iron frame and fixed, and different weight objects were attached to the respective rotors, and the same magnitude of excitation current was applied. Use the same time to measure the weight of the object when it falls from 1.5 meters high, and then compare the performance of the two, as shown in Table 1:

	物体重量Object weight	励磁电流Excitation current	下落用时Fall time	转子转速Rotor speed
锐角磁力阻尼器样机Sharp angle magnetic damper prototype	11.5公斤11.5 kg	4A4A	46s46s	6.9转/分6.9 rpm
涡流感应阻尼器样机Eddy current induction damper prototype	5.2公斤5.2 kg	4A4A	46s46s	6.9转/分6.9 rpm

It can be seen from the above table 1 that the time taken for the heavier object (11.5 kg) to fall from the same height to the ground and the lighter object (5.2 kg) fall from the same height to the ground under the same excitation current. The same time, which means that the heavier objects are subject to greater weight (resistance). The second set of tests: The sharp-angle magnetic damper prototype and the eddy current-sensing damper prototype were placed on a 1.5-meter-high iron frame and fixed, and the same weight object was hung on the respective rotors, and the same excitation current was passed, and the measurement was performed. The time when the object falls from 1.5 meters to the ground and then compares the performance of the two, as shown in Table 2 below:

	物体重量Object weight	励磁电流Excitation current	下落用时Fall time	转子转速Rotor speed
锐角磁力阻尼器样机Sharp angle magnetic damper prototype	5.2公斤5.2 kg	2A2A	27.82S27.82S	11.43转/分11.43 rpm
涡流感应阻尼器样机Eddy current induction damper prototype	5.2公斤5.2 kg	2A2A	8S8S	39.75转/分39.75 rpm

It can be seen from the above Table 2 that, when the same excitation current is applied, the same weight of the object of the same weight that is suspended from the prototype of the acute-angle magnetic damper descends from the same height to the ground for the same weight as that of the prototype of the eddy current induction damper. The time it takes for objects to fall from the same height to the ground is much longer, says It is clear that the object suspended from the prototype of the acute-angle magnetic damper is more resistant to falling and slower.

The third group of tests: the acute angle magnetic damper prototype and the eddy current induction damper prototype were placed on a 1.5 m high iron frame and fixed, and the same weight object was hung on the respective rotors, and the prototype was inserted in the acute angle magnetic damper prototype. The minimum excitation current for hovering the object, and the minimum excitation current is passed into the eddy current induction damper prototype to measure the time when the object falls from 1.5 meters to the ground, and then compare the performance of the two, as shown in Table 3 below:

	物体重量Object weight	励磁电流Excitation current	下落用时Fall time	转子转速Rotor speed
锐角磁力阻尼器样机Sharp angle magnetic damper prototype	2.1公斤2.1 kg	2.5A2.5A	(悬停)(hover)	0转/分0 rpm
涡流感应阻尼器样机Eddy current induction damper prototype	2.1公斤2.1 kg	2.5A2.5A	55S55S	5.78转/分5.78 rpm

It can be seen from Table 3 that, under the same excitation current, the object of the same weight suspended in the prototype of the acute-angle magnetic damper has hovered, and the object of the same weight suspended from the prototype of the eddy current-induced damper descends from the same height. The time taken to the ground is 55S, which also shows that the object hanging from the prototype of the acute-angle magnetic damper is more resistant to falling.

Through the above three sets of tests, it can be proved that in the low speed section (low speed), the acute magnetic damper provides a larger damping torque and has the hysteresis effect of air hovering, and the performance is obviously superior to the eddy current induction damper. .

Comparative Example 2: Comparison of performance of two dampers using slip motor

The slip motor (0.55 kW) is respectively connected with the acute angle magnetic damper prototype and the eddy current induction damper prototype coupling, and then the slip motor is connected to the three-phase power supply (the motor is a three-phase 4-pole, 0.55 kW, Voltage 380V, current 1.5A), and then input the appropriate slip control current to the slip motor. The test speed is from 50 rpm to 1200 rpm. The sharp angle magnetic damper prototype and the eddy current induction damper prototype respectively measure the damping torque. The comparison parameters are expressed by the input excitation current and current, as shown in Table 4 below:

For the description in Table 4 above:

1. Slip motor output rotation number: It is the number of revolutions of the driven shaft (connected to the rotor of the prototype). Generally, the number of revolutions of the driven shaft is 50-1200 rpm, and the number of revolutions of the driving shaft is 1430 rpm.

2. Slip control current: The excitation current input to the electromagnetic clutch coil in the slip motor.

3. Input excitation current: refers to the excitation current that is passed through the prototype of the acute-angle magnetic damper or the eddy current-induced damper, that is, the excitation current that flows into the damper stator.

4. Input motor current: Three-phase current input to the slip motor.

In the actual measurement, the input slip control current is basically the same (there is a slight change, which does not affect the comparison result); as can be seen from Table 4, the input motor current changes with the slip number, which is the normal slip motor. Regularity, that is, the higher the output rotation number of the slip motor, the smaller the motor input current is. Changes do not affect the comparison results. The corresponding number of revolutions per cell in Table 4 has the corresponding input excitation current data of the prototype of the acute-angle magnetic damper and the eddy current induction damper. The smaller the input excitation current, the larger the damping torque generated by the corresponding damper and the higher the efficiency.

Comparative example 3:

Comparison of Performance Tests of Two Kinds of Damper Proposals in High Speed Section Using 3-Phase 2-Pole Motor

In the high speed section, the speed is 1300 rev / min ~ 2800 rev / min. At such a high speed, the slip motor can no longer be used as the test power source. The two damper prototypes can be directly connected to the 3-phase 2-pole motor. During the test, the motor shaft power is controlled at 2.7 kW and the speed is 2820 rpm. These two parameters are fixed and used to test two respectively. A damper prototype. The excitation current of the acute angle magnetic damper prototype is 2.58A; the excitation current of the eddy current induction damper prototype is 2.6A, which shows that the performance of the acute magnetic damper in this high speed section is not worse than that of the eddy current induction damper. balance.

(3) Data analysis and application fields

Low speed section: 0 rpm / 50 rpm / including the speed of Table 1, Table 2, Table 3;

Medium speed section: 50 rev / min - 1200 rev / min;

High speed section: 1300 rev / min - 2800 rev / min;

In the low speed section, the example is explained at 50 rpm. In the 50 rpm column, the input excitation current of the acute magnetic damper prototype is 1.61A, and the input excitation current of the eddy current induction damper prototype is 2.12A, the difference between the two is 0.51A, which represents the difference. If the prototype of the acute-angle magnetic damper is to produce the same damping torque as the prototype of the eddy current induction damper, the prototype of the acute-angle magnetic damper needs to use less excitation current of 0.51A.

In the middle speed section, the lower the speed range, the smaller the difference between the input excitation current of the acute-angle magnetic damper prototype and the input excitation current of the eddy current induction damper prototype, because the eddy current induction effect increases with the increase of the rotational speed. , so the difference between the two is shrinking.

In the high speed section, due to limited test conditions, no multiple point test parameters are given from 1300 rpm. Number, provide a point parameter (2820 rev / min). However, as can be seen from Table 4, starting from 1000 rpm, the input excitation currents of the two prototypes are already very close, which shows that there is not much difference in performance between the two. According to the reasoning, there should be no difference in performance between the two prototypes at any speed point in the high speed section.

It can be seen from the above that the acute magnetic damper of the present invention has a larger damping torque than the eddy current induction damper under the same conditions in the range of 0 rpm to 1200 rpm, especially in the low speed range. Significantly, it fills the defect that the eddy current induction damper has poor induction effect in the low speed section, and has the characteristics of hysteresis effect. It has wider use value than the hysteresis and eddy current damper.

According to the unique feature of the present invention, the acute-angle magnetic damper can be applied to sports fitness equipment, instrument damping, deep well drilling auxiliary brakes, automobile retarders, train retarders, dynamometers, electromagnetic clutches and brake devices, and the like. There is an irreplaceable superiority in the field of terms.

The above-mentioned embodiments are merely illustrative of the embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An acute-angle magnetic damper characterized by comprising a stator excitation magnet and a rotor acute-angle magnetic body;

The stator magnetizer includes an outer ring and a plurality of pairs of field poles extending inward from the outer ring;

The rotor acute-angle magnetic body comprises a plurality of V-shaped structures having inner rings and radially distributed outward from the inner ring; adjacent two-arm joints of adjacent V-shaped structures constitute the induction magnetic pole; two outer sides of each V-shaped structure The angle formed by the edge of the strip is an angle A, and the angle is greater than zero degrees less than 90 degrees; the two sides of each V-shaped structure form a tip angle of B angle, and the angle is greater than zero degrees less than 90 degrees.
The acute-angle magnetic damper according to claim 1, wherein the angle of the angle A is 30 degrees - 60 degrees, and the angle of the angle B is 30 degrees - 60 degrees.
The acute magnetic damper according to claim 1, wherein the number of the magnetic poles is n, the number of the induced magnetic poles is m, and m and n satisfy the relationship 1: (n*2) ± 1 = m.
The acute magnetic damper according to claim 1, wherein the number of the magnetic poles is n, the number of the induced magnetic poles is m, and m and n satisfy the relationship 2: (n*2) ± 2 = m.
The acute-angle magnetic damper according to claim 3, wherein the number of pairs of the exciting magnetic poles is five, and the number of the sensing magnetic poles is eleven.
The acute-angle magnetic damper according to claim 4, wherein the number of pairs of the exciting magnetic poles is five, and the number of the sensing magnetic poles is twelve.
The acute-angle magnetic damper according to claim 1, wherein an intermediate portion of the field pole is wound with a wire for exciting the field pole.
The acute-angle magnetic damper according to claim 1, wherein the rotor acute-angle magnetic body is integrally formed.
The acute magnetic damper according to claim 1, wherein the field pole is a permanent magnet.